A shape resembling a shoemaker’s knife is constructed from a semicircle with diameter a with two semicircular “bites” of diameters b and 
.
. Write a function to compute the area 
of this shape as well as the area 
of a circle with diameter c, the length of the line tangent to the two smaller semicircles and touching the edge of the largest semicircle.
of this shape as well as the area of a circle with diameter c, the length of the line tangent to the two smaller semicircles and touching the edge of the largest semicircle.
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